C++ Deque Library - operator== Function


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Description

The C++ function std::deque::operator== tests whether two deque are same or not.

Declaration

Following is the declaration for std::deque::operator== function form std::deque header.

C++98

template <class T, class Alloc>
bool operator== (const deque<T, Alloc>& first, const deque<T, Alloc>& second);

Parameters

  • first − First deque object.

  • second − Second deque object of same type.

Return value

Returns true if first deque is same as second otherwise false.

Exceptions

This member function never throws exception.

Time complexity

Linear i.e. O(n)

Example

The following example shows the usage of std::deque::operator== function.

#include <iostream>
#include <deque>

using namespace std;

int main(void) {

   deque<int> d1 = {1, 2, 3, 4, 5};
   deque<int> d2 = {1, 2, 3, 4, 5};

   if (d1 == d2)
      cout << "Deque d1 and d2 are equal." << endl;

   d1.assign(2, 1);

   if (!(d1 == d2))
      cout << "Deque d1 and d2 are not equal." << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

Deque d1 and d2 are equal.
Deque d1 and d2 are not equal.
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